wcdma handover algorithm and parameters(fileminimizer) (1)
DESCRIPTION
Wcdma Handover Algorithm and Parameters(FILEminimizer) (1)TRANSCRIPT
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Revision Record
Course Code Product Product Version Course Version ISSUE
WRAN RAN12 Version 1.01
Developer/Modifier Time Approver New/Update
Leong kwong Onn
76320
2011-08 Update
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WCDMA Handover Algorithm and Parameters
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Foreword
Why mobile system need handover?
The mobility of UE
Load Balance
Any others?
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References
3GPP TS 23.122: Non Access Stratum functions related to Mobile
Station (MS) in idle mode
3GPP TS 24.008: Mobile radio interface layer 3 specification; Core
Network Protocols - Stage 3
3GPP TS 25.304: UE Procedures in Idle Mode and Procedures for Cell
Reselection in Connected Mode
3GPP TS 25.331: RRC Protocol Specification
3GPP TS 23.060: General Packet Radio Service (GPRS); Service
description
3GPP TS 25.931: UTRAN Functions, Examples on Signalling
Procedures
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Objectives
Upon completion of this course, you will be able to:
Explain the features of each handover
Describe the procedures of each handover
Perform the parameters setting of each handover
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The Basic Concepts of Handover
Active set
Monitored set
Detected set
Radio link (RL)
Radio link set (RLS)
Maximum ratio
combination
Selective combination
Soft handover gain
PCPICH
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Contents
1. Intra-Frequency Handover
2. Inter-Frequency Handover
3. Inter-RAT Handover
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Intra-Frequency Handover Types
The carrier frequencies of the current cell and target cell are
the same:
Intra-frequency soft handover
Intra-frequency hard handover
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Intra-Frequency Handover Types (Cont.)
Item Soft Handover Hard Handover
The number of RLs in
active set during
handover
Several One
Interruption during
handoverNo Yes
The frequencies of cells
Only happened
between Intra-
frequency cells
Can be happened in Intra-
frequency cells or Inter-
frequency cells
Comparison between soft handover and hard handover:
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Intra-Frequency Soft Handover
The types of intra-frequency soft handover are as follows:
Intra-NodeB soft handover (also known as softer handover)
Intra-RNC inter-NodeB soft handover
Inter-RNC soft handover
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Intra-Frequency Soft Handover (cont.)
Item Softer Handover Soft Handover
Scenario
When the UE is in the overlapped
coverage area of two
neighboring cells of a NodeB
with combined RLs
When the UE is in the
overlapped coverage area of
two neighboring cells of
different NodeBs
Uplink signal Using maximum-ratio
combination Using selection combination
Downlink
signal
Using maximum-ratio
combination
Using maximum-ratio
combination
Resource use Occupying less Iub bandwidth Occupying more Iub bandwidth
Comparison between soft handover and softer handover:
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Intra-Frequency Hard Handover
Intra-frequency hard handover:
No Iur interface
Iur interface is congested
Soft handover fails
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Intra-Frequency Handover Procedure
Decision
Execution
Measurement
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
1. Intra-Frequency Handover Measurement Quantities
2. Intra-Frequency Handover Measurement Events
3. Intra-Frequency Handover Neighboring Cell Combination
Algorithm
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Intra-Frequency Handover Measurement Measurement control:
UE UTRAN
MEASUREMENT CONTROL
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Intra-Frequency Handover Measurement (Cont.) Measurement report:
UE UTRAN
MEASUREMENT REPORT
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Intra-Frequency Handover Measurement Quantities
nnn MFF 1)1(
Measurement model in the WCDMA system:
L3 filtering formula:
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Parameters of Intra-Frequency Measurement IntraFreqMeasQuantity
Parameter name: Intra-freq Measure Quantity
Recommended value: CPICH_EC/NO
FilterCoef
Parameter name: Intra-freq meas L3 filter coeff
Recommended value: D3, namely K=3
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
1. Intra-Frequency Handover Measurement Quantities
2. Intra-Frequency Handover Measurement Events
3. Intra-Frequency Handover Neighboring Cell Combination
Algorithm
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Intra-Frequency Handover Measurement Events
Event Description
1AA primary CPICH enters the reporting range. This indicates that the quality of a cell is close to the quality of the best cell in the active set. A relatively high combined gain can be achieved when the cell is added to the active set.
1BA primary CPICH leaves the reporting range. This indicates that a cell has a lower quality than the best cell in the active set. The cell has to be deleted from the active set.
1C
A non-active primary CPICH becomes better than an active primary CPICH. This indicates that the quality of a cell is better than the quality of the worst cell in the active set. The RNC replaces a cell in the active set with a cell in the monitored set.
1D The best cell changes.
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Intra-Frequency Handover Measurement Events (Cont.)
)2/()1()( 111
aaBest
N
iiNewNew HRMWMWCIOM
A
1A event
Event 1A is triggered on the basis of the following formula:
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Intra-Frequency Handover Measurement Events (Cont.)
A: signal quality curve of the best cell in the active set
B: signal quality curve of a cell in the monitored set
C: curve of Th1A
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Parameters of Intra-Frequency Handover (Cont.) CIO
Parameter name: Cell oriented Cell Individual Offset
Recommended value: 0, namely 0dB
CIOOffset
Parameter name: Neighboring cell oriented CIO
Recommended value: 0, namely 0dB
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Parameters of Intra-Frequency Handover (Cont.) IntraRelThdFor1ACSNVP
Parameter name: CS non VP service 1A event relative THD
Recommended value: 6, namely 3dB
IntraRelThdFor1ACSVP
Parameter name: VP service 1A event relative THD
Recommended value: 6, namely 3dB
IntraRelThdFor1APS
Parameter name: PS service 1A event relative threshold
Recommended value: 6, namely 3dB
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Parameters of Intra-Frequency Handover (Cont.) Hystfor1A
Parameter name: 1A hysteresis
Recommended value: 0, namely 0dB
TrigTime1A
Parameter name: 1A event trigger delay time
Recommended value: D320, namely 320ms
Weight
Parameter name: Weighted factor
Recommended value: 0
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Intra-Frequency Handover Measurement Events (Cont.) 1A event report mode:
Event trigger report
Event to periodical report
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Parameters of Intra-Frequency Handover (Cont.) ReportIntervalfor1A
Parameter name: 1A event to periodical rpt period
Recommended value: D4000, namely 4000ms
PeriodMRReportNumfor1A
Parameter name: 1A event to periodical rpt number
Recommended value: D16
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Intra-Frequency Handover Measurement Events (Cont.)
)2/()1()( 111
bbBest
N
iiOldOld HRMWMWCIOM
A
1B event
Event 1B is triggered on the basis of the following formula:
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Intra-Frequency Handover Measurement Events (Cont.)
A: signal quality curve of the best cell in the active set
B: signal quality curve of the worst cell in the active set
C: curve of Th1B
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Parameters of Intra-Frequency Handover (Cont.) IntraRelThdFor1BCSNVP
Parameter name: CS non VP service 1B event relative THD
Recommended value: 12, namely 6dB
IntraRelThdFor1BCSVP
Parameter name: VP service 1B event relative THD
Recommended value: 12, namely 6dB
IntraRelThdFor1BPS
Parameter name: PS service 1B event relative threshold
Recommended value: 12, namely 6dB
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Parameters of Intra-Frequency Handover (Cont.) Hystfor1B
Parameter name: 1B hysteresis
Recommended value: 0, namely 0dB
TrigTime1B
Parameter name: 1B event trigger delay time
Recommended value: D640, namely 640ms
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Intra-Frequency Handover Measurement Events (Cont.)
2/1cInASInASNewNew HCIOMCIOM
1C event
Event 1C is triggered on the basis of the following formula:
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Intra-Frequency Handover Measurement Events (Cont.)
A: signal quality curve of the best cell in the active set
B: signal quality curve of a cell in the active set
C: signal quality curve of the worst cell in the active set
D: signal quality curve of a cell in the monitored set
E: curve of Th1C
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Parameters of Intra-Frequency Handover (Cont.) Hystfor1C
Parameter name: 1C hysteresis
Recommended value: 8, namely 4dB
TrigTime1C
Parameter name: 1C event trigger delay time
Recommended value: D640, namely 640ms
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Intra-Frequency Handover Measurement Events (Cont.) 1C event report mode:
Event trigger report
Event to periodical report
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Parameters of Intra-Frequency Handover (Cont.) ReportIntervalfor1C
Parameter name: 1C event to periodical rpt period
Recommended value: D4000, namely 4000ms
PeriodMRReportNumfor1C
Parameter name: 1C event to periodical rpt number
Recommended value: D16
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Intra-Frequency Handover Measurement Events (Cont.)
2/1dBestBestNotBestNotBest HCIOMCIOM
1D event
Event 1D is triggered on the basis of the following formula:
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Intra-Frequency Handover Measurement Events (Cont.)
A: signal quality curve of the best cell in the active set
B: signal quality curve of a cell in the active set or the monitored set
C: curve of Th1D
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Parameters of Intra-Frequency Handover (Cont.) Hystfor1D
Parameter name: 1D hysteresis
Recommended value: 8, namely 4dB
TrigTime1D
Parameter name: 1D event trigger delay time
Recommended value: D640, namely 640ms
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
1. Intra-Frequency Handover Measurement Quantities
2. Intra-Frequency Handover Measurement Events
3. Intra-Frequency Handover Neighboring Cell Combination
Algorithm
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Neighboring Cell Combination Algorithm
Cell A Cell B Cell C
Cell A Cell B Cell C A B C
Firstly, the cells inthe active set areadded.
Secondly, theneighboring cellsof cell A areadded.
After that, theneighboring cellsof cell B areadded.
Finally, theneighboring cellsof cell C areadded.
Cell A, Cell B and Cell Care in active set. Cell A isthe best cell. Cell BEc/No is greater thanCell C.
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Parameters of Neighboring Cell Combination Algorithm HO_MC_NCELL_COMBINE_SWITCH
Parameter name: Neighboring Cell Combination Switch
Recommended value: ON
NprioFlag
Parameter name: The flag of the priority
Recommended value: FALSE
Nprio
Parameter name: the priority of the neighboring cell
Recommended value: None
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Intra-Frequency Handover Decision and Execution The intra-frequency handover decision and execution
procedure depends on the different measurement events
that the RNC receives:
1A Event
1B Event
1C Event
1D Event
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Parameters of Intra-Frequency Handover (Cont.) MaxCellInActiveSet
Parameter name: Max number of cell in active set
Recommended value: 3
SHOQualmin
Parameter name: Min quality THD for SHO
Recommended value: -24, namely -24dB
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Rate Reduction After an SHO Failure
If the radio link addition for a soft handover fails, the rate
reduction is triggered for R99 NRT (Non Real Time) services to
increase the probability of a successful soft handover
1A,1C,1D is received by RNC
Execute admission control in target cell
Admission succeed?
Execute Handover
Rate Reduction
Estimation
Execution
Yes
No
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Estimation Procedure for Rate Reduction
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Parameters of Intra-Frequency Handover (Cont.) RelThdForDwnGrd
Parameter name: Relative threshold of SHO failure
Recommended value: 2, namely 1dB
ShoFailPeriod
Parameter name: Max evaluation period of SHO failure
Recommended value: 60, namely 60s
ShoFailNumForDwnGrd
Parameter name: Threshold number of SHO failure
Recommended value: 3
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Procedure of Rate Reduction Execution
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Parameters of Intra-Frequency Handover (Cont.) DcccShoPenaltyTime
Parameter name: Period of penalty timer for SHO failure
after down rate
Recommended value: 30, namely 30s
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Contents
1. Intra-Frequency Handover
1. Intra-Frequency Handover Overview
2. Intra-Frequency Handover Measurement
3. Intra-Frequency Handover Decision and Execution
4. Signaling Procedures for Intra-Frequency Handover
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Typical Soft Handover Flow (L3 Signaling)
Soft handover is triggered by 1A/1B/1C or 1D event
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Intra-Frequency Hard Handover
Intra-Frequency hard handover is triggered by 1D event
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Contents
1. Intra-Frequency Handover
2. Inter-Frequency Handover
3. Inter-RAT Handover
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Types
The carrier frequency of the current cell and target cell
are different
Based on the triggering causes of handover, inter-
frequency handover can be categorized into four types:
Coverage-based inter-frequency handover
QoS-based inter-frequency handover
Load-based inter-frequency handover
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
1. Inter-Frequency Handover Measurement Switches
2. Inter-Frequency Handover Measurement Report Modes
3. Inter-Frequency Handover Measurement Events
4. Inter-Frequency Handover Measurement Quantity
5. Inter-Frequency Handover Compressed Mode
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Measurement In the measurement phase of inter-frequency handover,
the UE takes measurement according to the
MEASUREMENT CONTROL message received from the
RNC. When the measurement report conditions are met,
the UE sends measurement reports to the RNC according
to the rules defined in the MEASUREMENT CONTROL
message.
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Inter-Frequency Handover Measurement Switches Switches related to inter-frequency handover:
HO_MC_SIGNAL_SWITCH: The switch decides when the RNC
performs the active set signal quality measurement.
HO_INTER_FREQ_HARD_HO_SWITCH: The switch decides
whether to enable the inter-frequency handover
measurement
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
1. Inter-Frequency Handover Measurement Switches
2. Inter-Frequency Handover Measurement Report Modes
3. Inter-Frequency Handover Measurement Events
4. Inter-Frequency Handover Measurement Quantity
5. Inter-Frequency Handover Compressed Mode
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Measurement Report Modes Event-triggered measurement report mode
UE test the Inter-frequency neighbor RSCP and Ec/No
Periodical measurement report mode
UE test the Inter-frequency neighbor RSCP and Ec/No, and
current cell Ec/No or RSCP
InterFreqReportMode
Parameter name: Inter-frequency measure report mode
Recommended value: Periodical reporting
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Inter-Frequency Handover Measurement Report Modes PrdReportInterval
Parameter name: Inter-frequency measure periodical rpt
period
Recommended value: D500, namely 500ms
InterFreqMeasTime
Parameter name: Inter-freq measure timer length
Recommended value: 60, namely 60s
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
1. Inter-Frequency Handover Measurement Switches
2. Inter-Frequency Handover Measurement Report Modes
3. Inter-Frequency Handover Measurement Events
4. Inter-Frequency Handover Measurement Quantity
5. Inter-Frequency Handover Compressed Mode
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Measurement Events Measurement events involved in inter-frequency
handover Event Description
2D The estimated quality of the currently used frequency is below a certain threshold.
2F The estimated quality of the currently used frequency is above a certain threshold.
2B The estimated quality of the currently used frequency is below a certain threshold and the estimated quality of a non-used frequency is above a certain threshold.
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Inter-Frequency Handover Measurement Events - 2D 2D event:
The estimated quality of the currently used frequency is
below a certain threshold.
Event 2D is triggered on the basis of the following formula:
QUsed ≤ TUsed2d - H2d/2
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Parameters of Inter-Frequency Handover -2D
Parameter Recommended Value
InterFreqCSThd2DEcN0 -14, namely -14dB
InterFreqR99PsThd2DEc
N0
-14, namely -14dB
InterFreqHThd2DEcN0 -14, namely -14dB
InterFreqCSThd2DRSCP -95, namely -95dBm
InterFreqR99PsThd2DRS
CP
-95, namely -95dBm
InterFreqHThd2DRSCP -95, namely -95dBm
Recommended values of TUsed2d :
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Parameters of Inter-Frequency Handover -2D
Parameter Recommended Value
InterFreqCSThd2DEcN0 -14, namely -14dB
InterFreqR99PsThd2DEc
N0
-14, namely -14dB
InterFreqHThd2DEcN0 -14, namely -14dB
InterFreqCSThd2DRSCP -95, namely -95dBm
InterFreqR99PsThd2DRS
CP
-95, namely -95dBm
InterFreqHThd2DRSCP -95, namely -95dBm
Recommended values of TUsed2d :
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Parameters of Inter-Frequency Handover - 2D (Cont.) HystFor2D
Parameter name: 2D hysteresis
Recommended value: 4, namely 2dB
TimeToTrig2D
Parameter name: 2D event trigger delay time
Recommended value: D320, namely 320ms
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Inter-Frequency Handover Measurement Events - 2F 2F event
The estimated quality of the currently used frequency is
above a certain threshold.
Event 2F is triggered on the basis of the following formula:
QUsed ≥ TUsed2f + H2f/2
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Parameters of Inter-Frequency Handover -2F
Parameter Recommended Value
InterFreqCSThd2FEcN0 -12, namely -12dB
InterFreqR99PsThd2FEcN
0
-12, namely -12dB
InterFreqHThd2FEcN0 -12, namely -12dB
InterFreqCSThd2FRSCP -92, namely -92dBm
InterFreqR99PsThd2FRSC
P
-92, namely -92dBm
InterFreqHThd2FRSCP -92, namely -92dBm
Recommended values of TUsed2f :
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Parameters of Inter-Frequency Handover -2F
Parameter Recommended Value
InterFreqCSThd2FEcN0 -12, namely -12dB
InterFreqR99PsThd2FEcN
0
-12, namely -12dB
InterFreqHThd2FEcN0 -12, namely -12dB
InterFreqCSThd2FRSCP -92, namely -92dBm
InterFreqR99PsThd2FRSC
P
-92, namely -92dBm
InterFreqHThd2FRSCP -92, namely -92dBm
Recommended values of TUsed2f :
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Parameters of Inter-Frequency Handover - 2F (Cont.) HystFor2F
Parameter name: 2F hysteresis
Recommended value: 4, namely 2dB
TimeToTrig2F
Parameter name: 2F event trigger delay time
Recommended value: D1280, namely 1280ms
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Inter-Frequency Handover Measurement Events - 2B 2B event:
The estimated quality of the currently used frequency is
below a certain threshold and the estimated quality of a
non-used frequency is above a certain threshold
Event 2B is triggered on the basis of the following formula:
QNoused ≥ TNoused2b + H2b/2
QUsed ≤ TUsed2b - H2b/2
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Inter-Frequency Handover Measurement Events - 2B 2B event:
The estimated quality of the currently used frequency is
below a certain threshold and the estimated quality of a
non-used frequency is above a certain threshold
Event 2B is triggered on the basis of the following formula:
QNoused ≥ TNoused2b + H2b/2
QUsed ≤ TUsed2b - H2b/2
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Parameters of Inter-Frequency Handover - 2B Recommended values of TNoused2b :
Parameter Recommended Value
TargetFreqCsThdEcN0 -12, namely -12dB
TargetFreqR99PsThdEcN
0
-12, namely -12dB
TargetFreqHThdEcN0 -12, namely -12dB
TargetFreqCsThdRscp -92, namely -92dBm
TargetFreqR99PsThdRscp -92, namely -92dBm
TargetFreqHThdRscp -92, namely -92dBm
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Parameters of Inter-Frequency Handover - 2B Recommended values of TNoused2b :
Parameter Recommended Value
TargetFreqCsThdEcN0 -12, namely -12dB
TargetFreqR99PsThdEcN
0
-12, namely -12dB
TargetFreqHThdEcN0 -12, namely -12dB
TargetFreqCsThdRscp -92, namely -92dBm
TargetFreqR99PsThdRscp -92, namely -92dBm
TargetFreqHThdRscp -92, namely -92dBm
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Parameters of Inter-Frequency Handover - 2B (conj.) Recommended values of TUsed2b :
Parameter Recommended Value
UsedFreqCSThdEcN0 -12, namely -12dB
UsedFreqR99PsThdEcN0 -12, namely -12dB
UsedFreqHThdEcN0 -12, namely -12dB
UsedFreqCSThdRSCP -92, namely -92dBm
UsedFreqR99PsThdRSCP -92, namely -92dBm
UsedFreqHThdRSCP -92, namely -92dBm
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Parameters of Inter-Frequency Handover - 2B (conj.) Recommended values of TUsed2b :
Parameter Recommended Value
UsedFreqCSThdEcN0 -12, namely -12dB
UsedFreqR99PsThdEcN0 -12, namely -12dB
UsedFreqHThdEcN0 -12, namely -12dB
UsedFreqCSThdRSCP -92, namely -92dBm
UsedFreqR99PsThdRSCP -92, namely -92dBm
UsedFreqHThdRSCP -92, namely -92dBm
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Parameters of Inter-Frequency Handover -2B (Cont.) HystFor2B
Parameter name: 2B hysteresis
Recommended value: 4, namely 2dB
TimeToTrig2B
Parameter name: 2B event trigger delay time
Recommended value: D0, namely 0ms
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Parameters of Inter-Frequency Handover - Common CIO
Parameter name: Cell oriented Cell Individual Offset
Recommended value: 0, namely 0dB
CIOOffset
Parameter name: Neighboring cell oriented CIO
Recommended value: 0, namely 0dB
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Parameters of Inter-Frequency Handover - Common (Cont.) HystForPrdInterFreq
Parameter name: HHO hysteresis
Recommended value: 0, namely 0dB
TimeToTrigForPrdInterFreq
Parameter name: HHO period trigger delay time
Recommended value: 0, namely 0ms
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
1. Inter-Frequency Handover Measurement Switches
2. Inter-Frequency Handover Measurement Report Modes
3. Inter-Frequency Handover Measurement Events
4. Inter-Frequency Handover Measurement Quantity
5. Inter-Frequency Handover Compressed Mode
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Measurement Quantity
Measurement quantities vary according to the types of inter-frequency
handover
In inter-frequency handover based on coverage, event (2B/2D/2F) or
periodical measurement takes both CPICH Ec/No and RSCP as measurement
quantities
In inter-frequency handover based on QoS, event (2B) or periodical
measurement takes both CPICH Ec/No and RSCP as measurement quantities.
In load-based inter-frequency blind handover, CPICH RSCP of the used
frequency is measured.
In load- and measure-based inter-frequency handover, both CPICH_RSCP and
CPICH_Ec/No of the target frequency are measured
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
1. Inter-Frequency Handover Measurement Switches
2. Inter-Frequency Handover Measurement Report Modes
3. Inter-Frequency Handover Measurement Events
4. Inter-Frequency Handover Measurement Quantity
5. Inter-Frequency Handover Compressed Mode
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-Frequency Handover Compressed Mode Compressed Mode control is a mechanism whereby
certain idle periods are created in radio frames during
which the UE can perform measurements on other
frequencies.
If the UE needs to measure the pilot signal strength of an
inter-frequency 3G or 2G cell and has a single-frequency
receiver only, the UE must use the compressed mode.
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Inter-Frequency Handover Compressed Mode The parameter DlSFLimitCMInd decides whether to start the DL
compressed mode according to the parameter LimitCMDlSFThd
If DlSFLimitCMInd = True
When the downlink spreading factor is smaller than or equal to the
parameter LimitCMDlSFThd, the compressed mode is disabled
When the downlink spreading factor is greater than the parameter
LimitCMDlSFThd, the compressed mode is enabled
If DlSFLimitCMInd = False and the compressed mode is not limited
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Inter-Frequency Handover Compressed Mode DlSFLimitCMInd
Parameter name: Dl SF limit CM ind
Recommended value: FALSE
LimitCMDlSFThd
Parameter name: Dl SF threshold to limit CM
Recommended value: D8 , namely SF8
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Inter-Frequency Handover Compressed Mode Categories
Downlink compressed mode
Uplink compressed mode
Realization Methods
Spreading factor reduction (SF/2)
Higher layer scheduling
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Inter-Frequency Handover Compressed Mode DlSFTurnPoint
Parameter name: Dl SF threshold
Recommended value: D64
UlSFTurnPoint
Parameter name: Ul SF threshold
Recommended value: D64
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
3. Inter-Frequency Handover Decision and Execution
1. Coverage- and QoS-based Inter-Frequency Handover Decision and
Execution
2. Load-based Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Coverage- and QoS-based Inter-
Frequency Handover Procedure
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Reporting Mode
The coverage- and QoS-based inter-frequency handovers
are categorized into two types according to the following
two measurement report modes:
Periodical measurement report mode
Event-triggered measurement report mode.
Each mode corresponds to a different decision and
execution procedure.
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Periodical Measurement Report Mode
After receiving the periodical measurement report of the
inter-frequency cell, the RNC starts the following
decision procedures:
Decide whether both the CPICH Ec/No value and CPICH RSCP
value of the pilot signal of the target cell meet the requirement of
inter-frequency handover. The evaluation formula is : Mother_Freq +
CIOother_Freq ≥ Tother_Freq + H/2
Start the hard handover time-to-trigger timer, which is configured
through the parameter TimeToTrigForPrdInterFreq
If Mother_Freq + CIOother_Freq < Tother_Freq - H/2, stop the
timer
Select the cells in sequence, that is, from high quality cells to low
quality ones, to initiate inter-frequency handover
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Periodical Measurement Report Mode
Periodical measurement report mode:
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Event-Triggered Measurement Report Mode After receiving the event 2B measurement reports of
CPICH RSCP and CPICH Ec/No of the inter-frequency cell,
the RNC starts the following procedure:
Add all the pilot cells that trigger event 2B to a cell set and
arrange the cells according to the measurement quality of
CPICH_Ec/No in descending order
Select the cells in turn from the cell set to perform inter-
frequency handover
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
3. Inter-Frequency Handover Decision and Execution
1. Coverage- and QoS-based Inter-Frequency Handover Decision and
Execution
2. Load-based Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Load-based Inter-Frequency Handover
The LDR algorithm may trigger an inter-frequency
handover.
The inter-frequency LDR handover can be performed
based on blind handover or measurement that can be
decided by the parameter
InterFreqLDHOMethodSelection
InterFreqLDHOMethodSelection
Parameter name: InterFreq Load Handover Method
Selection
Recommended value: BLINDHOPage102
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Load-based Inter-Frequency Blind Handover
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Load-based Inter-Frequency Blind Handover Decision The LDR algorithm learns that a cell is in basic congestion
and provides target cells and the UE with low priority for
handover.
The RNC determines to trigger an inter-frequency blind
handover.
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Load-based Inter-Frequency Blind Handover Decision If the UE is not in soft handover state, the RNC directly
performs load-based inter-frequency blind handover.
If the UE is in soft handover state, the RNC operates based on
the following conditions:
If the HO_ALGO_LDR_ALLOW_SHO_SWITCH is set to ON, the RNC
determines whether the cell that triggers LDR is the best cell:
If this cell is the best cell, the RNC initiates an intra-frequency
measurement for load-based inter-frequency blind handover. If this cell is
not the best cell, the RNC does not initiate a load-based inter-frequency
blind handover.
If the HO_ALGO_LDR_ALLOW_SHO_SWITCH is set to OFF, the RNC
does not initiate a load-based inter-frequency blind handover.
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Load-based Inter-Frequency Blind Handover Execution 1. The RNC initializes the timer of intra-frequency measurement for
blind handover.
2. The RNC initiates a periodical intra-frequency measurement.
3. After receiving from the UE the intra-frequency measurement
reports for conditional blind handover, the RNC checks whether the
following condition is met:
CPICH RSCP of the cell in the measurement report >=
BlindHOQualityCondition
If the condition is met, the RNC increments the counter of the number of
intra-frequency measurement reports for blind handover by 1.
If the condition is not met, the RNC does not perform a blind handover to
the cell that triggers LDR and stops intra-frequency measurement for blind
handover.
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Load-based Inter-Frequency Blind Handover Execution 4. When the counter reaches the value of
BlindHOIntrafreqMRAmount, the RNC initiates a blind
handover to the target cell.
5. If the timer of intra-frequency measurement for blind
handover expires, the RNC does not perform a blind
handover to the target cell and stops intra-frequency
handover measurement for blind handover.
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Parameters of Load-based Inter-Frequency Blind Handover BlindHOFlag
Parameter name: Blind handover flag
Recommended value: False
HO_ALGO_LDR_ALLOW_SHO_SWITCH
Parameter name: HandOver switch
Recommended value: ON
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Parameters of Load-based Inter-Frequency Blind Handover (Cont.) BlindHOIntrafreqMRInterval
Parameter name: Intrafrequency measurement report
interval of blind HO
Recommended value: D250, namely 250ms
BlindHOQualityCondition
Parameter name: Blind handover condition
Recommended value: -92, namely -92dBm
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Parameters of Load-based Inter-Frequency Blind Handover (Cont.) BlindHOIntrafreqMRAmount
Parameter name: Intrafrequency measurement report
amount of blind handover
Recommended value: D2, namely 2 times
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Load-based Inter-Frequency Measure-based Handover
Page111
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Load-based Inter-Frequency Measure-based Handover Decision and Execution The LDR algorithm learns that a cell is in basic congestion
and provides target cells and the UE with low priority for
handover.
The RNC selects the target cell based on the
measurement results. The report period is specified by
the parameter PrdReportInterval.
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Load-based Inter-Frequency Measure-based Handover Decision and Execution The target cell must meet the following conditions:
The CPICH RSCP value of the target cell is larger than
TargetFreqThdRscp.
The CPICH Ec/No value of the target cell is larger than
TargetFreqThdEcN0
The target cell is not in the basic congestion state.
The RNC performs an inter-frequency hard handover to
the target cell directly.
Page113
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Parameters of Load-based Inter-Frequency Measure-based Handover DrdOrLdrFlag
Parameter name: DrdOrLdrFlag
Recommended value: FALSE(Do not send)
PRDREPORTINTERVAL
Parameter name: Inter-freq Measure Periodical Report Period
Recommended value: D3000, namely 3000ms
TARGETFREQTHDRSCP
Parameter name: Inter-freq Target Frequency Trigger RSCP THD
Recommended value: -92, namely -92dBm
TARGETFREQTHDECN0
Parameter name: Inter-freq Target Frequency Trigger Ec/No THD
Recommended value: -12, namely -12dB
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Contents
2. Inter-Frequency Handover
1. Inter-Frequency Handover Overview
2. Inter-Frequency Handover Measurement
3. Inter-Frequency Handover Decision and Execution
4. Signaling Procedures for Inter-Frequency Handover
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Inter-frequency Handover
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Contents
1. Intra-Frequency Handover
2. Inter-Frequency Handover
3. Inter-RAT Handover
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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Inter-RAT Handover Scenarios
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Inter-RAT Handover Types
Based on the triggering causes of handover, inter-
frequency handover can be categorized into five types:
Coverage-based 3G to 2G handover
QoS-based 3G to 2G handover
Load-based 3G to 2G handover
Service-based 3G to 2G handover
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3G-to-2G Handover Preconditions
Before handover, the RNC checks whether all the preconditions
for the 3G-to-2G handover are met:
Service handover indicators
Service requirements
Handover rules
Before deciding the 3G-to-2G handover, the RNC checks
whether all the preconditions are met :
2G cell capability
Service capability
UE capability
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Service Handover Indicator
The IE Service Handover Indicator indicates the CN policy
for the service handover to the 2G network. It is
indicated in the RAB assignment signaling assigned by
the CN, or provided by the RNC
The algorithm switch HoSwitch:
HO_INTER_RAT_RNC_SERVICE_HO_SWITCH decides
whether the service attribute of inter-RAT handover is
based on the RNC or the CN
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Service Handover Indicator
Through the SHIND parameter, the service handover indicators
are set in RNC as follows:
HO_TO_GSM_SHOULD_BE_PERFORM: means that the handover to
the 2G network is performed when 2G signals are available.
HO_TO_GSM_SHOULD_NOT_BE_PERFORM: means that the
handover to the 2G network is performed when 3G signals are
weak but 2G signals are strong.
HO_TO_GSM_SHALL_NOT_BE_PERFORM: means that the handover
to the 2G network is not performed even when 3G signals are
weak but 2G signals are strong.
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Rules for Enabling 3G-to-2G Handover
Rules for enabling Coverage- and QoS-based 3G-to-2G
handover:
Service Handover Indicator:
HO_TO_GSM_SHOULD_BE_PERFORM
HO_TO_GSM_SHOULD_NOT_BE_PERFORM
Impacts of different types of capability on handover
decision:
Refer to the following table
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Rules for Enabling 3G-to-2G Handover
Rules for enabling Load-based 3G-to-2G handover: :
Service Handover Indicator:
HO_TO_GSM_SHOULD_BE_PERFORM
HO_TO_GSM_SHOULD_NOT_BE_PERFORM
Impacts of different types of capability on handover
decision:
Refer to the following table
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Rules for Enabling 3G-to-2G Handover
Rules for enabling Service-based 3G-to-2G handover: :
Service Handover Indicator:
HO_TO_GSM_SHOULD_BE_PERFORM
Impacts of different types of capability on handover
decision:
Refer to the following table
Switches for Service-based 3G-to-2G Handover
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2G Cell Capability
2G cell capability is configured through the parameter
RATCELLTYPE. This parameter indicates whether the cell
supports the GSM, GPRS, or EDGE.
RATCELLTYPE
Parameter name: Inter-RAT cell type
Recommended value: None
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Service Capability
The Required 2G Capability (Req2GCap) specifies the
capability of 2G cells required by inter-RAT handover.
This indicates whether the service is supported by the
GSM, GPRS, or EDGE
Req2GCap
Parameter name: Required 2G Capability
Recommended value: None
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UE Capability
Upon the reception of the UE capability information
message, the RNC decides whether to start the inter-RAT
measurement. The information indicates whether the UE
supports the GSM, GPRS, or EDGE.
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Inter-RAT Handover Rules (Cont.)
Rules for service-based 3G to 2G Handover
Service Handover Indicator
HO_TO_GSM_SHOULD_BE_PERFORM
Three types of capability:
Refer to the table of load-based handover
Service switch
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
1. 3G-to-2G Handover Measurement Switches
2. 3G-to-2G Handover Measurement Report Modes
3. 3G-to-2G Handover Measurement Events
4. 3G-to-2G Handover Measurement Quantity
5. 3G-to-2G Handover Compressed Mode
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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3G-to-2G Handover Measurement Switches The 3G-to-2G handover measurement switches are specified by
the sub-parameters of HoSwitch:
HO_MC_SIGNAL_SWITCH: The switch decides whether the quality
measurement on the active set is delivered after signaling setup
but before service setup.
HO_INTER_RAT_PS_OUT_SWITCH: The switch decides whether the
RNC will initiate inter-RAT measurement to trigger inter-RAT
handover of the PS domain from the UTRAN.
HO_INTER_RAT_CS_OUT_SWITCH: The switch decides whether the
RNC will initiate inter-RAT measurement to trigger inter-RAT
handover of the CS domain from the UTRAN.
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
1. 3G-to-2G Handover Measurement Switches
2. 3G-to-2G Handover Measurement Report Modes
3. 3G-to-2G Handover Measurement Events
4. 3G-to-2G Handover Measurement Quantity
5. 3G-to-2G Handover Compressed Mode
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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3G-to-2G Handover Measurement Report Modes Event-triggered measurement report mode
UE test the 2G neighbor RSSI
Periodical measurement report mode
UE test the 2G neighbor RSSI, and current cell Ec/No or
RSCP
InterRatReportMode
Parameter name: Inter-RAT report mode
Recommended value: PERIODICAL_REPORTING
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3G-to-2G Handover Measurement Report Modes InterRATPeriodReportInterval
Parameter name: Inter-RAT period report interval [ms]
Recommended value: D1000 , namely 1000ms
InterRATMeasTime
Parameter name: Inter-RAT measure timer length [s]
Recommended value: 60, namely 60s
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
1. 3G-to-2G Handover Measurement Switches
2. 3G-to-2G Handover Measurement Report Modes
3. 3G-to-2G Handover Measurement Events
4. 3G-to-2G Handover Measurement Quantity
5. 3G-to-2G Handover Compressed Mode
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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3G-to-2G Handover Measurement Events Measurement events involved in 3G-to-2G Handover
Event Description
Event 2D The estimated quality of the currently used frequency is below a certain threshold.
Event 2F The estimated quality of the currently used frequency is above a certain threshold.
Event 3A The estimated quality of the currently used UTRAN frequency is below a certain threshold and the estimated quality of the other system is above a certain threshold.
Event 3C The estimated quality of other system is above a certain threshold.
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3G-to-2G Handover Measurement Events - 2D 2D event:
The estimated quality of the currently used frequency is
below a certain threshold.
Event 2D is triggered on the basis of the following formula:
QUsed ≤ TUsed2d - H2d/2
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Parameters of 3G-to-2G Handover - 2D
Recommended values of TUsed2d :
Parameter Recommended Value
InterRATCSThd2DEcN0 -14, namely -14dB
InterRATR99PsThd2DEcN0 -15, namely -15dB
InterRATHThd2DEcN0 -15, namely-15dB
InterRATCSThd2DRSCP -100, namely -100dBm
InterRATR99PsThd2DRSCP -110, namely -110dBm
InterRATHThd2DRSCP -110, namely -110dBm
HystFor2D 4, namely 2dB
TimeToTrig2D D320, namely 320ms
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3G-to-2G Handover Measurement Events – 2F 2F event:
Event 2F is triggered on the basis of the following formula:
QUsed ≥ TUsed2f + H2f/2
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Parameters of 3G-to-2G Handover - 2F
Parameter Recommended Value
InterRATCSThd2FEcN0 -12, namely -12dB
InterRATR99PsThd2FEcN0 -13, namely -13dB
InterRATHThd2FEcN0 -13, namely-13dB
InterRATCSThd2FRSCP -97, namely -97dBm
InterRATR99PsThd2FRSCP -107, namely -107dBm
InterRATHThd2FRSCP -107, namely -107dBm
HystFor2F 4, namely 2dB
TimeToTrig2F D1280, namely 1280ms
Recommended values of 2F event:
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3G-to-2G Handover Measurement Events - 3A 3A event:
The estimated quality of the currently used UTRAN
frequency is below a certain threshold and the estimated
quality of the other system is above a certain threshold
Event 3A is triggered on the basis of the following formula:
QOtherRAT + CIOOtherRAT ≥ TOtherRAT + H3a/2
QUsed ≤ TUsed - H3a/2
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Parameters of Inter-Frequency Handover -3A
Parameter Recommended Value
UsedFreqCSThdEcN0 -12, namely -13dB
UsedFreqR99PsThdEcN0 -13, namely -13dB
UsedFreqHThdEcN0 -13, namely -13dB
UsedFreqCSThdRSCP -97, namely -97dBm
UsedFreqR99PsThdRSCP -107, namely -107dBm
UsedFreqHThdRSCP -107, namely -107dBm
Recommended values of TUsed :
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Parameters of Inter-Frequency Handover -3A (Cont.)
Parameter Recommended Value
TargetRatCsThd 16, namely -95dBm
TargetRatR99PsThd 16, namely -95dBm
TargetRatHThd 16, namely -95dBm
Recommended values of TOtherRAT:
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Parameters of Inter-Frequency Handover -3A (Cont.) Hystfor3A
Parameter name: 3A hysteresis
Recommended value: 4, namely 2dB
TrigTime3A
Parameter name: 3A event trigger delay time
Recommended value: D0, namely 0ms
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3G-to-2G Handover Measurement Events – 3C 3C event:
The estimated quality of other system is above a certain
threshold
Event 3C is triggered on the basis of the following formula:
MOtherRAT + CIOOtherRAT ≥ TOtherRAT + H3c/2
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Parameters of Inter-Frequency Handover -3C
Parameter Recommended Value
InterRATNCovHOCSThd 21, namely -90dBm
InterRATNCovHOPSThd 21, namely -90dBm
Hystfor3C 0, namely 0dB
TrigTime3C D640, namely 640ms
Recommended values of 3C :
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Parameters of Inter-Frequency Handover - Common CIO
Parameter name: Cell oriented Cell Individual Offset
Recommended value: 0, namely 0dB
CIOOffset
Parameter name: Neighboring cell oriented CIO
Recommended value: 0, namely 0dB
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
1. 3G-to-2G Handover Measurement Switches
2. 3G-to-2G Handover Measurement Report Modes
3. 3G-to-2G Handover Measurement Events
4. 3G-to-2G Handover Measurement Quantity
5. 3G-to-2G Handover Compressed Mode
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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3G-to-2G Handover Measurement Quantity In coverage-based UMTS-to-GSM handover,
Event 2D/2F or periodical measurement takes both CPICH Ec/No and
RSCP as measurement quantities
In coverage-based inter-RAT handover, the system delivers both
CPICH Ec/N0 and CPICH RSCP for 2D/2F measurement
The event 3A measurement quantity is set through the parameter
MeasQuantityOf3A
In QoS-based 3G-to-2G handover, the event 3A measurement
quantity is set through the parameter
UsedFreqMeasQuantityForQos3A
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3G-to-2G Handover Measurement Quantity MeasQuantityOf3A
Parameter name: 3A Measure Quantity
Recommended value: Auto, namely based on the 2D
UsedFreqMeasQuantityForQos3A
Parameter name: 3A Used-Freq Measure Quantity for Qos
Recommended value: CPICH_RSCP
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
1. 3G-to-2G Handover Measurement Switches
2. 3G-to-2G Handover Measurement Report Modes
3. 3G-to-2G Handover Measurement Events
4. 3G-to-2G Handover Measurement Quantity
5. 3G-to-2G Handover Compressed Mode
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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3G-to-2G Handover Compressed Mode
The 3G-to-2G handover compressed mode is the same
with inter-frequency handover compressed mode.
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Interoperability between Inter-RAT and Inter-Frequency Handover
Inter-frequency measurement:
2D, 2F event
Inter-frequency neighboring cell
Inter-RAT measurement:
2D, 2F event
Inter-RAT neighboring cell
Measure inter-RAT neighbor?
Measureinter-frequency
neighbor?
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Parameters of Inter-RAT Handover
InterFreqRATSwitch
Parameter name: Inter-freq and Inter-RAT coexist switch
Recommended value: SIMINTERFREQRAT
CoexistMeasThdChoice
Parameter name: InterFreq and InterRat coexist measure
threshold choice
Recommended value:
COEXIST_MEAS_THD_CHOICE_INTERFREQ
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
3. 3G-to-2G Handover Decision and Execution
1. Coverage and QoS-based UMTS-to-GSM Handover Decision and
Execution
2. Load- and Service-based 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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Coverage and QoS-based UMTS-to-GSM Handover Procedure
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Reporting Mode
The coverage-based and QoS-based 3G-to-2G handover is
categorized into two types according to the following
two measurement report modes:
Periodical measurement report mode
Event-triggered measurement report mode
Each mode corresponds to a different decision and
execution procedure.
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Periodical Measurement Report Mode
After receiving the periodical measurement report of GSM
cells, the RNC performs the following decision and execution
procedures:
Decide whether the quality of 2G cells meets the conditions of
inter-RAT handover. The evaluation formula is:
Mother_RAT + CIOother_RAT ≥ Tother_RAT + H/2
Start the evaluation of the cells that meet the quality requirement
and start the time-to-trigger timer. If the measurement report
meet the following formula and time-to-trigger timer does not
expire, stop the time-to-trigger timer
Mother_RAT + CIOother_RAT < Tother_RAT - H/2
Select the cells in sequence, that is, from high quality cells to low
quality ones, to initiate 3G-to-2G handover
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Parameters of Inter-RAT Handover (Cont.) HystforInterRAT
Parameter name: Inter-RAT hysteresis
Recommended value: 0, namely 0dB
TimeToTrigForVerify
Parameter name: Time to trigger for verified GSM cell
Recommended value: 0, namely 0ms
TimeToTrigForNonVerify
Parameter name: Time to trigger for non-verified GSM cell
Recommended value: 0, namely 0ms
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Event-Triggered Measurement Report Mode After receiving the event 3A measurement report of 2G
cells, the RNC performs the following decision and
execution procedures:
Put all the 2G cells that trigger event 3A into a cell set and
arrange the cells according to the measurement quality in
descending order
Select the cells in sequence from the cell set to perform
inter-RAT handover
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
3. 3G-to-2G Handover Decision and Execution
1. Coverage and QoS-based UMTS-to-GSM Handover Decision and
Execution
2. Load- and Service-based 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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Load-based Inter-RAT Handover
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Service-based Inter-RAT Handover
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Load- and Service-based 3G-to-2G Handover The load status between the source cell and the target
cell can be acquired by interchanging load information
between a 3G cell and a 2G cell during the load-based
and service-based 3G-to-2G handover.
Thus, whether to further conduct the handover can be
determined to avoid the 2G cell overload and possible
handover to the congested cell.
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Decision and Execution Procedure
After receiving the event 3C measurement report of 2G
cells, the RNC performs the following handover decision
and execution procedure:
Put all the 2G cells that trigger event 3C into a cell set and
arrange the cells according to the measurement quality in
descending order
Select the cells in sequence from the cell set
InterRATHOAttempts
Parameter name: Inter-RAT handover max attempt times
Recommended value: 16
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Interchanging Load Information Procedure 1. When the RNC sends a RELOCATION REQUIRED
message to the 3G CN,
If the switch SndLdInfo2GsmInd is set to ON, the
RELOCATION REQUIRED message includes the Old BSS To
New BSS Information IE that includes the load information
of the 3G source cell.
If the switch SndLdInfo2GsmInd is set to OFF, then the
RELOCATION REQUIRED message does not include the Old
BSS To New BSS Information IE.
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Interchanging Load Information Procedure 2. When the RNC receives the RELOCATION COMMAND message from
the 2G CN:
If the switch NcovHoOn2GldInd is set to ON, the RNC obtains the load
information of the 2G target cell:
If the 2G load is lower than CSHOOut2GloadThd or PSHOOut2GloadThd, the RNC
continues the inter-RAT handover procedure; otherwise, the RNC returns the
Relocation Cancel message to the CN to cancel this inter-RAT handover and makes
another handover attempt to the next candidate cell generated in the cell list based on
inter-RAT measurement.
If the Inter-System Information Transparent Container IE, is not included in the
RELOCATION COMMAND message, the load information of the 2G target cell is not
considered and this inter-RAT handover is continued
If the switch NcovHoOn2GldInd is set to OFF, the RNC continues the inter-
RAT handover procedure without considering the thresholds
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Parameters of Interchanging Load Information SndLdInfo2GsmInd
Parameter name: Send Load Info to GSM Ind
Recommended value: ON
NcovHoOn2GldInd
Parameter name: NCOV Reloc Ind based on GSM cell load
Recommended value: ON
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Parameters of Interchanging Load Information CSHOOut2GloadThd
Parameter name: CS domain Reloc GSM load THD
Recommended value: 80, namely 80%
PSHOOut2GloadThd
Parameter name: PS domain Reloc GSM load THD
Recommended value: 60, namely 60%
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Parameters of Service-based Inter-RAT Handover
CSServiceHOSwitch
Parameter name: Inter-RAT CS handover switch
Recommended value: OFF
PSServiceHOSwitch
Parameter name: Inter-RAT PS handover switch
Recommended value: OFF
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Contents
3. Inter-RAT Handover
1. Inter-RAT Handover Overview
2. 3G-to-2G Handover Measurement
3. 3G-to-2G Handover Decision and Execution
4. Signaling Procedures for Inter-RAT Handover
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CS Domain Inter-RAT Handover Flow (UMTS->GSM)
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CS Domain Inter-RAT Handover Flow (UMTS->GSM)
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PS Domain Inter-RAT Handover Flow (UMTS->GSM & UE in CELL_DCH)
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